NO. 1395. CAMBRIAN BRACHIOFODA—WALCOTT. 307 



Mr. l?illiiigs proposed the genus Kutonjiixi in a footnote acconi- 

 pan34ng the description of the type species K. clmjuhitd. He says: 



Since the above was written I have examined many cast.s of the interior of this 

 species, and am inclined to the opinion that it is generically distinct from OboleUa 

 chwiixitJca. From the very considerable elevation of- the beak the dorsal valve must 

 have an area and probably a foramen. In one specimen there are two large oval 

 impressions faintly impresse<l, but still distinctly visible. There is no trace of the 

 lateral scars; and tlie form, notwithstanding the characters of the surface, conveys 

 the idea of an Orthisina. Should, upon further examination, my suspicions turn out 

 to be well founded, I shall call the genus Kulorgimi, after the celebrated European 

 naturalist, Kutorga. 



From our present information of the genus the following diagnosis 

 is prepared: 



Shells inequivalve, transverse or elongated. Ventral valve convex, 

 with apex marginal or incurved over the pseudoarea. Cardinal area 

 rudimentary, without delthyrium or well-detined pseudodeltidium. 

 The latter usually extends one-half the distance from the apex to the 

 plane of the posterior margins of the valve. Interior of the ventral 

 valve with well-detined main vascular sinuses, with a visceral area 

 ])etween the sinuses. Dorsal valve flat or slightly convex, rising to a 

 small, elevated um])o; apex marginal and usually pointing upward; 

 cardinal area short, rudimentary, and without well-defined pseudodel- 

 tidium. Interior of ventral Naive with median septum between the 

 central and posterior lateral muscle scars. 



Ohservationa. — The short cardinal areas of the valves leave a broad 

 open space between them for the passage of the pedicle. The areas 

 are more than the i-eflected posterior margins of the valves, as they 

 have transverse lines of g*rowth and a suggestion of a pseudodeltidium. 

 These features are more rudimentary than in Iphidella. Kutorgina 

 includes the larger calcareous shells, and Tphidella the somewhat more 

 specialized, smaller, corneous shells. The exterior form of the valves 

 of Kutorgina suggest NtHitsia festinata^ with which the type species, 

 K. cmgiiJafa^ is associated in Vermont and at Bic Harbor. 



The following species are now referred to Kutorgina: 



K cingidata Billings, K. j>enigata Walcott, K. mrdiniaensis Wal- 

 cott, and K. sp. luidet. All the species are from the lower Cambrian 

 horizon, with the possible exception of K. sardmiaensis. 



Of species heretofore referred to the genus the following disposition 

 is made: 



I\. Jidjradorlca BiW'mgs = Ip/i Id ella. 



K labradorica siaantonensii<= Tphidella. 



K. latourensis Matthew = P/v^/cr;'////,9. 



K. oninutisHima. Hall and V^l^hW^Ad^ IpJddella sculptilis. 



K. pannula White = Iphidella. 



K. 'prospecteni<is W ale ott = Ijdu'd ell a. 



